土木專業(yè)畢業(yè)設(shè)計(jì)中英對(duì)照外文翻譯--建筑結(jié)構(gòu)在沖擊負(fù)載作用下連續(xù)倒塌分析方法-建筑結(jié)構(gòu)-資料下載頁(yè)
2025-05-12 14:29本頁(yè)面
【導(dǎo)讀】對(duì)于一個(gè)經(jīng)濟(jì)的，續(xù)倒塌分析方法是絕對(duì)必要且可信的。要求精確和簡(jiǎn)要，而且容易上手，立竿見影。因而，最近許多研究者都在發(fā)展可靠有效和直。在最近的干物上，當(dāng)前在文獻(xiàn)資料中找得到的。人們廣泛討論它們的適宜性、適用性和可靠性。也提出了最近剛剛完成的關(guān)于鋼筋混凝土框架在爆破荷載下的連續(xù)倒塌新分析方法。者是不成比例的一大部分倒塌”。其含義為一個(gè)或者一組關(guān)鍵承重構(gòu)件的失效造成周圍構(gòu)件。建筑結(jié)構(gòu)的連續(xù)倒塌可能由一系列的意外和人為的因。的關(guān)注如何建造抵抗由于爆炸和沖擊荷載造成連續(xù)倒塌的建筑。于阿根廷猶太人互濟(jì)會(huì)，被恐怖分子襲擊并倒塌。實(shí)際損壞和數(shù)值模擬的結(jié)果的很好的一致性，證明了細(xì)致。他們的模型包括整個(gè)世界貿(mào)易中心北塔的建筑和波音767客機(jī)。計(jì)算結(jié)果表明，對(duì)北塔遭受撞擊和倒塌的科。爆炸被假定在地表引發(fā)。這次爆炸相當(dāng)于1000公斤TNT當(dāng)量，換算距離為,這樣只
【正文】 urse， certain finite elements are still needed to be developed DYN method in progressive analysis of RC flame Hao et ai proposed a DYN method based on the continuum damage mechanics theory． The main difference between this method and other direct simulation methods is that the explosion initialization and blast wave propagation were not directly modeled． Instead， blast loads acting on the structure were calculated first using the formulae given in TM5—1300 and Ref.． Then they are directly applied on front， side，roof and rear of the building structure． This method was used to analyze structural progressive collapse of a threestorey and twospan reinforced concrete（ RC） frame structure． Computer software LS． DYNA with user—defined subroutines was used to perform the analyses． Fig． 5 gives the configuration of the RC frame and the explosive location． In the analysis， the blast was assumed to be detonated on ground surface． The blast weight was chosen to be 1 000kg equivalent of TNT， while the scaled distance used was 1． 7 m／ kg ， at which only the first floor middle column would collapse due to blast effects． Fig． 6 shows the numerical results of the structural progressive collapse obtained from DYN method analysis． As can be seen， DYN method gives reasonable prediction of the RC frame collapse under critical blast load． In their study， parisons were also made between results from DYN method， GSA and DoD guidelines based alternative load path methods． It was found both the GSA and DoD based alternative load path methods may not give reliable prediction of structural progressive collapse and usually underestimate the stress and strain response at the supporting joint above the blast damaged columns. As mentioned above， the great improvement of the DYN method is that， interaction between the blast wave and building structure， blast initial and blast wave propagation are not needed to be directly simulated． It uses the profound knowledge of blast load distribution to define the blast loads and then directly apply them to the structure． This could dramatically decrease the size of finite element model and increase the efficiency of the simulation． To sum up， the direct simulation method can yield reliable predictions of structural collapse to blast and impact loads， but it is extremely time consuming， and requires a profound knowledge of structural dynamics， damage mechanics， dynamic material properties and putational skills． It is therefore not practical for mon engineering application． The practicability of this category of methods could be improved in the following way： 1)Developing new finite element， which is not only simple to be established and calculated， but also can represent the plex behavior of structural ponents such as nonlinear and dynamic effects； 2） Proposing new method of accurately predicting blast loads around the building structures in different blast scenarios． With the development of puter science， with the improvement of the finite element model and the progress of the load application method， the direct simulation method might bee an accurate and efficient way in doing progressive collapse analysis of structural building under blast and impact loads.
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